CN220271678U - Optical device for shaping laser beam - Google Patents
Optical device for shaping laser beam Download PDFInfo
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- CN220271678U CN220271678U CN202321953556.3U CN202321953556U CN220271678U CN 220271678 U CN220271678 U CN 220271678U CN 202321953556 U CN202321953556 U CN 202321953556U CN 220271678 U CN220271678 U CN 220271678U
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- 239000011521 glass Substances 0.000 claims abstract description 63
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- 239000000835 fiber Substances 0.000 claims description 17
- 239000005304 optical glass Substances 0.000 claims description 10
- 239000004065 semiconductor Substances 0.000 claims description 3
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Abstract
The utility model relates to an optical device for shaping laser beams, which comprises a graded index glass structural member, wherein the middle part of the graded index glass structural member is a cylinder, one end of the graded index glass structural member is a wedge angle surface, the other end of the graded index glass structural member is a convex cylindrical surface, the wedge angle surface of the graded index glass structural member faces a laser source, a single-mode Gaussian laser beam emitted by the laser source is divided into two laser beams with a certain included angle after reaching the wedge angle surface, the laser beams are converged into a collimated beam from divergence to reach the convex cylindrical surface in the graded index glass structural member, the convex cylindrical surface focuses on a straight beam, and the two laser beams with a certain included angle are simultaneously focused and overlapped, so that the shaping of the laser beams with the original Gaussian distribution is realized. The optical device has simple structure, small volume and low realization cost.
Description
Technical Field
The utility model relates to the technical field of laser radars, in particular to an optical device for laser beam shaping.
Background
Since the advent of lasers, lasers have been used in many fields, including optical communications, medical, industrial, etc., with the advantages of excellent monochromaticity, divergence angle, high power density, etc. Due to the continuous and vigorous development of unmanned technologies, various research institutions and companies at home and abroad are driven to research on vehicle-mounted imaging laser radars. The vehicle-mounted laser radar is suitable for vehicle-mounted installation, has small volume and light weight, and is suitable for vehicles; the peak power of the emission is high, and a far ranging range can be achieved; the requirement of batch loading can be met by high precision and low cost. The perception capability of the automobile is greatly improved by the high-performance laser radar, traffic hazards are effectively avoided, meanwhile, travel cost is reduced by automatic driving, traffic accidents caused by human errors are effectively avoided, and better, safe and convenient travel experience is enjoyed. In recent two years, along with the mass production of the vehicle-mounted laser radar, the automatic driving accelerates and evolves, the laser radar discharge is driven, and the mass production scale expansion can promote the price of the laser radar to explore.
The emergent light beams of some existing laser radars adopt a plurality of lasers (such as 128), the lasers of all the lasers are collimated and emergent, and all the collimated light beams form a certain angle (such as 25 degrees) for emergent. The laser radar adopting the mode has high cost and large volume. The self-focusing lens made of graded (GRIN/gradient) refractive index materials is mainly applied to the imaging fields of optical passive devices (such as laser coupling, optical fiber coupling, optical isolator, optical wavelength division multiplexer and the like) for optical communication, endoscopes and the like, wherein two end faces are planes.
Disclosure of Invention
The utility model aims to provide an optical device for laser beam shaping, which has the advantages of simple structure, small volume and low realization cost.
In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows: the utility model provides an optical device for laser beam shaping, includes graded index glass structure, graded index glass structure middle part is the cylinder, and one end is the wedge angle face, and the other end is the convex cylinder, the wedge angle face of graded index glass structure is towards the laser source, the single mode Gaussian laser beam that the laser source sent out divides into two laser beams that have a certain contained angle after reaching the wedge angle face, and the laser beam begins to converge into the collimation light beam from dispersing in the graded index glass structure and reaches the convex cylinder, and the convex cylinder focuses on the straight beam, and two laser beams that have a certain contained angle focus simultaneously and overlap to the plastic of the laser of original Gaussian distribution is realized.
Further, the graded index glass structural member is an integral structure, and the whole graded index glass structural member is composed of graded index glass.
Further, the graded index glass structural member is composed of a front end portion having a wedge angle surface, a middle cylinder and a rear end portion having a convex cylindrical surface, the middle cylinder is composed of graded index glass, and the front end portion and the rear end portion are composed of optical glass or graded index glass.
Further, the graded index glass structure is formed by connecting a cylinder and a rear end part, wherein the front end of the cylinder is provided with a wedge angle surface, the rear end of the rear end part is provided with a convex cylindrical surface, the cylinder is formed by graded index glass, and the rear end part is formed by optical glass or graded index glass.
Further, the laser light source adopts a fiber laser, a semiconductor laser or a solid laser, or couples laser into a single-mode fiber, and emits a single-mode Gaussian laser beam from the end face of the single-mode fiber.
Further, the convex cylindrical surface can be replaced by a concave cylindrical surface so as to align the straight light beam for divergence.
Compared with the prior art, the utility model has the following beneficial effects: the optical device for shaping the laser beam mainly comprises a graded index glass structural member, wherein one end of the optical device, which is close to the laser beam, is a wedge angle surface, and the other end of the optical device is a convex cylindrical surface, the laser beam is shaped through a simple structural design, the volume is small, the realization cost is low, the problems of high cost and large volume of the laser radar in the prior art are solved, and the optical device has strong practicability and wide application prospect.
Drawings
FIG. 1 is a front view of an optical device structure according to an embodiment of the present utility model;
FIG. 2 is a top view of an optical device structure according to an embodiment of the present utility model;
FIG. 3 is a schematic view of an optical device according to an embodiment of the utility model;
FIG. 4 is a schematic view of an optical device according to another embodiment of the present utility model;
fig. 5 is a schematic view of an optical device according to another embodiment of the present utility model.
Detailed Description
The utility model will be further described with reference to the accompanying drawings and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
As shown in fig. 1 and 2, this embodiment provides an optical device for shaping a laser beam, including a graded index glass structure, the middle part of the graded index glass structure 1 is a cylinder, one end is a wedge angle surface, the other end is a convex cylindrical surface, the wedge angle surface of the graded index glass structure faces towards a laser source, a single-mode gaussian laser beam emitted by the laser source is divided into two beams with a certain included angle after reaching the wedge angle surface, the beams are converged into a collimated beam from the beginning of divergence in the graded index glass structure to reach the convex cylindrical surface, the convex cylindrical surface focuses the straight beam along the cylindrical surface direction, and the two beams with a certain included angle are simultaneously focused and overlapped, so that the shaping of the laser with the original gaussian distribution is realized, line laser with uniform distribution can be generated, and the angular distribution of the light intensity can be adjusted as required.
In this embodiment, the laser source may be an optical fiber laser, a semiconductor laser or a solid state laser, or may couple laser into a single mode fiber, and emit a single mode gaussian laser beam from an end face of the single mode fiber.
In this embodiment, the convex cylindrical surface may be replaced by a concave cylindrical surface to diverge the straight beam, and may also generate a linear light spot.
As shown in fig. 3, the graded-index glass structure 101 may be a unitary structure, and the entire graded-index glass structure 101 is composed of graded-index glass. As shown in fig. 4, the graded-index glass structure may be constituted by connecting a front end 201 having a wedge surface, a middle cylinder 202, and a rear end 203 having a convex cylindrical surface, the middle cylinder 202 being constituted by graded-index glass, and the front end 201 and the rear end 203 being constituted by optical glass or graded-index glass. As shown in fig. 5, the graded-index glass structure may be formed by connecting a cylindrical body 501 and a rear end 502, wherein the front end of the cylindrical body 501 has a wedge surface, the rear end of the rear end 502 has a convex cylindrical surface, the cylindrical body 501 is formed of graded-index glass, and the rear end 502 is formed of optical glass or graded-index glass. In fig. 3 to 5, 2 is a laser light source.
Example 1
In a first embodiment, the graded index glass structure is a unitary structure.
A single-mode gaussian laser beam exits from the end face of the single-mode fiber, the laser wavelength is 1550nm, and na=0.09.
The distance d=0.87 mm between the light-emitting end face of the single-mode fiber and the top of the wedge angle face, the wedge angle θ=12.5 degrees between the wedge angle face and the cylinder cross section, the length L=3.68 mm of the whole graded index glass structural member, and the curvature radius R=0.56 mm of the convex cylinder.
The whole graded-index glass structural member is composed of graded-index glass, and the refractive index equation of the graded-index glass is as follows:
wherein:
wherein n is refractive index, n0 is refractive index of the axis, A is square of refractive index distribution constant, r is distance from the axis, and lambda is wavelength; B. c, K0, K1, K2 are all calculated dispersion coefficients, b=1.6032, c=0.00814, k0= 0.3287, k1= 0.005364, k2= 0.0002626.
Table 1 principal parameters of example one
Example two
In the second embodiment, the graded index glass structural member is composed of a front end portion having a wedge angle surface, a middle cylinder, and a rear end portion having a convex cylinder.
A single-mode gaussian laser beam exits from the end face of the single-mode fiber, the laser wavelength is 1550nm, and na=0.09.
The distance d=1.57 mm between the light emergent end face of the single-mode fiber and the top of the wedge angle face, the wedge angle θ=35.0 degrees between the wedge angle face and the cross section of the cylinder, the length L1=0.63 mm of the front end part, the length L2=2.48 mm of the middle cylinder, the length L3=0.80 mm of the rear end part and the curvature radius R=0.56 mm of the convex cylinder.
The front and rear end portions were composed of optical glass having a trade name of H-K9L, a d-ray refractive index nd=1.5168, and an abbe number vd= 64.20. The middle cylinder is composed of graded index glass, and the refractive index equation of the graded index glass is as follows:
wherein:
wherein n is refractive index, n0 is refractive index of the axis, A is square of refractive index distribution constant, r is distance from the axis, and lambda is wavelength; B. c, K0, K1, K2 are all calculated dispersion coefficients, b=1.6032, c=0.00814, k0= 0.3287, k1= 0.005364, k2= 0.0002626.
TABLE 2 principal parameters of example two
Example III
In the third embodiment, the graded index glass structure member is composed of a front end portion having a wedge angle face, a middle cylinder, and a rear end portion having a convex cylinder.
A single-mode gaussian laser beam exits from the end face of the single-mode fiber, the laser wavelength is 1550nm, and na=0.09.
The distance d=1.48 mm between the light emergent end face of the single-mode fiber and the top of the wedge angle face, the wedge angle θ=30.0 degrees between the wedge angle face and the cross section of the cylinder, the length L1=0.52 mm of the front end part, the length L2=2.65 mm of the middle cylinder, the length L3=0.80 mm of the rear end part and the curvature radius R=1.00 mm of the convex cylinder.
The front and rear end portions were composed of optical glass having a trade name of H-K9L, a d-ray refractive index nd=1.5168, and an abbe number vd= 64.20. The middle cylinder is composed of graded index glass, and the refractive index equation of the graded index glass is as follows:
wherein:
wherein n is refractive index, n0 is refractive index of the axis, A is square of refractive index distribution constant, r is distance from the axis, and lambda is wavelength; B. c, K0, K1, K2 are all calculated dispersion coefficients, b=1.6032, c=0.00814, k0= 0.3287, k1= 0.005364, k2= 0.0002626.
TABLE 3 principal parameters of example three
Example IV
In the fourth embodiment, the graded index glass structure member is composed of a front end portion having a wedge angle face, a middle cylinder, and a rear end portion having a convex cylinder.
A single-mode gaussian laser beam exits from the end face of the single-mode fiber, the laser wavelength is 1550nm, and na=0.09.
The distance d=1.17 mm between the light emergent end face of the single-mode fiber and the top of the wedge angle face, the wedge angle θ=20.0 degrees between the wedge angle face and the cross section of the cylinder, the length L1=0.33 mm of the front end part, the length L2=3.08 mm of the middle cylinder, the length L3=0.80 mm of the rear end part and the curvature radius R=0.95 mm of the convex cylinder.
The front and rear end portions were composed of optical glass having a trade name of H-K9L, a d-ray refractive index nd=1.5168, and an abbe number vd= 64.20. The middle cylinder is composed of graded index glass, and the refractive index equation of the graded index glass is as follows:
wherein:
wherein n is refractive index, n0 is refractive index of the axis, A is square of refractive index distribution constant, r is distance from the axis, and lambda is wavelength; B. c, K0, K1, K2 are all calculated dispersion coefficients, b=1.6032, c=0.00814, k0= 0.3287, k1= 0.005364, k2= 0.0002626.
TABLE 4 principal parameters of example four
Example five
In a fifth embodiment, the graded-index glass structure member is formed by connecting a cylindrical body and a rear end portion, wherein the front end of the cylindrical body is provided with a wedge angle surface, and the rear end of the rear end portion is provided with a convex cylindrical surface.
The single-mode Gaussian laser beam is emitted from the end face of the single-mode optical fiber, the laser wavelength is 1550nm, and NA=0.09;
the distance d=1.99 mm between the light-emitting end face of the single-mode fiber and the top of the wedge angle face, the wedge angle θ=15.0 degrees between the wedge angle face and the cross section of the cylinder, the length L1=5.29 mm of the cylinder, the length L2=1.00 mm of the rear end part, and the curvature radius R of the convex cylinder=1.45 mm;
the rear end portion is made of optical glass with the trade name of H-ZLaF4LA, and has a d-ray refractive index nd= 1.9108 and an abbe number vd=35.25. The cylinder is composed of graded index glass, and the refractive index equation of the graded index glass is as follows:
wherein:
wherein n is refractive index, n0 is refractive index of the axis, A is square of refractive index distribution constant, r is distance from the axis, and lambda is wavelength; B. c, K0, K1, K2 are all calculated dispersion coefficients, b=1.6107, c=0.0098, k0= 0.1973, k1= 0.003723, k2=3.96E-06.
Table 5 principal parameters of example five
The above description is only a preferred embodiment of the present utility model, and is not intended to limit the utility model in any way, and any person skilled in the art may make modifications or alterations to the disclosed technical content to the equivalent embodiments. However, any simple modification, equivalent variation and variation of the above embodiments according to the technical substance of the present utility model still fall within the protection scope of the technical solution of the present utility model.
Claims (6)
1. The utility model provides an optical device for laser beam shaping, its characterized in that includes graded index glass structure, graded index glass structure middle part is the cylinder, and one end is the wedge angle face, and the other end is the convex cylinder, the wedge angle face of graded index glass structure is towards the laser source, the single mode Gaussian laser beam that the laser source sent out divides into two laser beams that have a certain contained angle after reaching the wedge angle face, and the laser beam begins to converge into the collimation light beam and reaches the convex cylinder from dispersing in graded index glass structure, and the convex cylinder focuses on the straight light beam, and two laser beams that have a certain contained angle focus simultaneously and overlap to the plastic of laser to original Gaussian distribution is realized.
2. An optical device for shaping a laser beam as claimed in claim 1, wherein the graded index glass structure is a unitary structure, and the entire graded index glass structure is made of graded index glass.
3. An optical device for shaping a laser beam according to claim 1, wherein the graded index glass structure is composed of a front end portion having a wedge angle surface, a middle cylinder, and a rear end portion having a convex cylindrical surface, the middle cylinder being composed of graded index glass, and the front end portion, the rear end portion being composed of optical glass or graded index glass.
4. An optical device for shaping a laser beam according to claim 1, wherein the graded index glass structure is composed of a cylindrical body having a wedge angle surface at a front end and a rear end portion having a convex cylindrical surface at a rear end, the cylindrical body being composed of graded index glass, and the rear end portion being composed of optical glass or graded index glass.
5. An optical device for shaping a laser beam according to claim 1, wherein the laser light source is a fiber laser, a semiconductor laser or a solid state laser, or couples laser light into a single mode fiber, and emits a single mode gaussian laser beam from an end face of the single mode fiber.
6. An optical device for laser beam shaping according to claim 1, wherein the convex cylindrical surface is also replaced by a concave cylindrical surface to diverge in alignment with the straight beam.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321953556.3U CN220271678U (en) | 2023-07-24 | 2023-07-24 | Optical device for shaping laser beam |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321953556.3U CN220271678U (en) | 2023-07-24 | 2023-07-24 | Optical device for shaping laser beam |
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| CN220271678U true CN220271678U (en) | 2023-12-29 |
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| CN202321953556.3U Active CN220271678U (en) | 2023-07-24 | 2023-07-24 | Optical device for shaping laser beam |
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